Initial SIMDBC interpreter.

runtime/platform/globals.h

Index: runtime/platform/globals.h
diff --git a/runtime/platform/globals.h b/runtime/platform/globals.h
index d1c6ef636165bcca9da87356a5c1439702ab6bcb..d5e959c54914acd42f0d8af51b04e9057899035b 100644
--- a/runtime/platform/globals.h
+++ b/runtime/platform/globals.h
@@ -279,6 +279,7 @@ typedef simd128_value_t fpu_register_t;
 #if !defined(TARGET_ARCH_X64)
 #if !defined(TARGET_ARCH_IA32)
 #if !defined(TARGET_ARCH_ARM64)
+#if !defined(TARGET_ARCH_DBC)
 // No target architecture specified pick the one matching the host architecture.
 #if defined(HOST_ARCH_MIPS)
 #define TARGET_ARCH_MIPS 1
@@ -298,6 +299,7 @@ typedef simd128_value_t fpu_register_t;
 #endif
 #endif
 #endif
+#endif
 
 // Verify that host and target architectures match, we cannot
 // have a 64 bit Dart VM generating 32 bit code or vice-versa.
@@ -334,6 +336,9 @@ typedef simd128_value_t fpu_register_t;
 #define USING_SIMULATOR 1
 #endif
 
+#elif defined(TARGET_ARCH_DBC)
+#define USING_SIMULATOR 1
+
 #else
 #error Unknown architecture.
 #endif